Turkish characters to uppercase

Question

I can't make uppercase of turkish characters like Giriş Tex converts it to GIRIş instead of GİRİŞ.. It's making me crazy.

%this is mwe i guess
\documentclass[12pt,a4paper]{article}

\usepackage[utf8]{inputenc}
\usepackage{titlesec}

\usepackage[T1]{fontenc}
\usepackage[turkish]{babel}
\usepackage{pslatex}
\begin{document}
\uppercase{Giriş}
\end{document}

Answer 1

It's a deficiency in the setup by babel:

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[turkish]{babel}

\addto\extrasturkish{%
  \uccode`i=\string"9D \uccode\string"19 = `I
  \lccode\string"9D=`i \lccode`I=\string"19 }
\addto\noextrasturkish{%
  \uccode`i=`I \lccode`I=`i }

\begin{document}
\MakeUppercase{Giriş}

\MakeLowercase{GİRİŞ}
\end{document}

It's better to do it this way instead of globally changing the tables.

In the T1 encoding the character "dotless i" is at position "19 and "dotted I" is at "9D.